Territory



(No Model.)

J. A. FARRELL 8: W. DOUGLAS.

' FURNACE BLAST APPARATUS.

No. 603,181. Patented Apr. 26, 1898.

UNITED STATES PATENT. OFFICE.

JOHN A. FARRELL AND WALTER DOUGLAS, or MoRENoI, ARIZONA TERRITORY.

FURNACE-BLAST APPARATUS.

SPECIFICATION forming part of Letters I'atent No. 603,181, dated April 26, 1898.

Application filed November 12, 1897. Serial No. 658,352. (No model.)

To all whom it may concern.-

Beit known that we, JOHN A. FARRELL, a' citizen of the United States, and WALTER DOUGLAS, a subject of the Queen of Great Britain, residing at Morenci, in the county of Graham and Territory of Arizona, have invented certain new and useful Improvements in Furnace-Blast- Apparatus; and we dohereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to furnaces and Bessemer converters of that type wherein an airblast is introduced to promote combustion or to supply an increased amount of oxygen to the mineral under treatment, such blast passin g from a wind-chest into the furnace through one or more twyer-ducts in the furnace-wall provided for that purpose.

The object of this invention is to provide an improved and labor-saving construction of wind-chest having a valve-controlled opening in its outer wall in line with said twy'er-duct, said valve being normally seated to prevent escape of the blast, but adapted to be unseated to permit of a barQbeing inserted through the opening and thrust through the twyer-duct into the furnace.

In the accompanying drawings'hereto annexed and forming part of this specification, Figure 1 is a vertical sectional view of a portion of a furnace and a wind-chest embody-- ing our invention. Fig. 2 is an inner side View of the outer wall of the wind-chest and an enlarged detail front view of the gravity- Valve, and Fig. 3 a vertical longitudinal section of the chest-wall and a side elevation of the valve.

Referring now more particularly to the accompanying drawings, 1 represents a portion of the base of a furnace, and 2' a twyer-duct extending through the wall thereof and leading from the exterior into the shaft or tunnel.

The wind chest or box 3'is arranged onthe exterior of the furnace and serves as a reservoir for the blast, which enters the furnace through said twyer-duct. A pipe 4, leading from a-pump or other suitable compressing In accordance with our invention the outer wall 5 of the wind-chest is provided with a peep-orifice 6 in line with the twyer-ductand leading to the atmosphere, the inner surface of said wall at the orifice being countersunk to form a valve-seat 7. The peep-orifice is governed by an inwardly-opening gravityvalvewhich prevents the escape of the blast to the atmosphere. The specific form of valve shown in the present instance forperforming this function comprises a yoke 8, having an arm 9, pivoted to lugs or cars 10 on the inner side of the wall 5. A ball-valve 11 is mounted loosely on an axis 12, fixed in the arms of the yoke in such manner as to revolve freely and normally tilt down by gravity and seat to close the orifice, the pressure of the blast also serving to 'hold said valve seated. The valve thus prevents the blast from escaping to the atmosphere, while adapted to open under pressure from the exterior to permit of a bar being inserted within the orifice 6 and thrust through the twyer-duct into the furnace.

It will be understood that changes in the form, proportion, and minor details of construction may be made within the scope of the invention without departing from the spirit or sacrificing any of the advantages thereof.

Having thus fully described our invention, what we claim as new and useful, and desire to secure by Letters Patent, is'- -1. In blast-furnaces, the combination with a furnace provided with a. twyer-duct in its side wall, of a wind-chest having a peep-orifice in line with the duct, and a gravity-valve governing said orifice and consisting of a pivoted arm and a ball-valve mounted to freely rotate on an axis carried by said arm, substantially as described. 1

2. In blast-furnaces, the combination with the furnace provided in its wall with a twyerduct, of a wind-chest having an orifice in its outer wall in line with said duct, and a valve device governing said orifice comprising a yoke, provided with an arm pivoted on the inner side of said wind-chest wall, and a ballvalve loosely mounted on an axis fixed in the In testimony whereof we affix our signaarins of the yoke, said valve device being tures in presence of two witnesses. adapted to open inwardly to permit of a bar being inserted within the orifice and thrust through the twyer-duct into the furnace, and to close automatically by gravity upon the removal of said bar, substantially as described.

JOHN A. FARRELL. \VALTER DOUGLAS.

Witnesses:

R. S. VAN GOODER, M. E. THORPE. 

